Vendor specific >= Default >= More strictīy using the “more strict” method, the health value decreases drastically in case of any small problem, so the use of this method is recommended only when no (even small) problem is allowed.We are digital librarians. Note: usually the different health values follow the formula: Note: the selected calculation method is saved into the reports to prevent confusion.
On the advanced options page it is possible to modify the calculation method any time. Upgrading from 1.40 or older version may result in a different health value display. Note: 1.40 and previous versions of Hard Disk Sentinel had only more strict, recommended for servers calculation method. If (on the same hard disk) the threshold for the “Seek error rate” is 30, the value is 60, and the initial value is 90, the condition of this attribute is 50 % and the overall health of the hard disk is 37.5 %. Multiplying these values will give the overall health of the hard disk condition.įor example: the threshold for the “Reallocated sectors count” is 36, the value is 84 and the initial value for this attribute was 100. All such attributes will have a small condition value calculated between 0 and 100% based on the actual value, the threshold and the theoretical maximum value (the latter is determined by Hard Disk Sentinel based on the manufacturer and model). If this option is selected, the health-related S.M.A.R.T.
Other problems may decrease the health value more. With other words, if the value of the “Off line uncorrectable sectors” is high, the health value of the disk cannot be larger than 30 %. For example, if the “Off line uncorrectable sectors” attribute contains 0200 in the “Data” column (which is 512 if converted to decimal value), the heatlh should fall by 512 x 1 = 512 %, but the limit for this attribute is only 70 %. The limit % defines how much % can the attribute decrease the overall health value. The more strict calculation method gives 100 x (100 – 2×6) % x (100 – 5×4) % = 70 % as the resulting health value. If the “Current pending sectors count” attribute has 0005 in the “Data” column also on the same hard disk, the health is = 98 x ( 100 – 5×0.6) % = 95 %. If the “Reallocated sectors count” attribute has 0002 in the “Data” column, the health value = 100 x ( 100 – 2×1 ) % = 98 % The lower 16 bits (righmost 4 digits) are used in the calculation method.įor example: using the default calculation method. These should be converted to decimal before calculation. Note : the Data column contains hexadecimal values. status of (unusable) hard disks received for data recovery. The numbers are determined by examining the arrived reports and the S.M.A.R.T. Weights and limits for the default calcuation method: attributes affecting the health value with their weights and maximum limits: The following tables contain the health related (critical) S.M.A.R.T. If the more strict, recommended for servers option is used the values are much more strict, the problems may reduce the health much drastically. By using the default method, the weights and limits (see below) are lighter. The overall health percent value is calculated by multiplying the remaining percent values (100 – degradation %).Ĭurrently, Hard Disk Sentinel has two different such methods. These attributes have a pre defined weight and a maximum limit value (the latter defines the maximum degradation in health value for the attribute). parameters (if they are available, it depends on the manufacturer) decrease this value. The hard disk has 100% condition initially. Also an improper sensor should be ignored or its value should be modified (please see temperature calibration about this). For example after replacing a problemmatic power supply, the problems encountered previously should be ignored. The result should be controlled in some situations.
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